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In the countrysides the thunder and lightning's accidents happen from time to time, many are because of the personnel incompetent work, therefore sometimes we had met the electricity cannot deliver's embarrassing situation, very hurtful.

Thunder and lightning accident cause factor.

The high-tension side arrester is apart from the transformer to be excessively far. Because of the position designs' installs not correct, when causes the high-tension side arrester the junction to be apart from distribution transformer's high-pressured terminal to be away from is excessively long, but after thunder and lightning invasion, the voltage size and the arrester are apart from transformer's distance to be proportional. If transformer insulation withstanding lightning surge's ability cannot achieve this value, will damage the transformer. Therefore, reduces the arrester to be apart from transformer's distance as far as possible, is advantageous to transformer's security.

The lightning arrester protection installment is not standard. In the lightning arrester protection in the installation process, installs the craft, the quality requirement besides the guarantee, the lightning protection meets the grounding not to transfer back coils around. But related technical personnel in the installation process because of artistic to neglect these. 

The earth resistance does not meet the requirement. Whether does distribution transformer's antimine device play the good protective function, the grounding quality is very important. We discovered that has the quite many countryside distribution transformer grounding not to meet the requirement. Because for in long lasting work, protective earthing device, because the air or the environment pollution, as well as other outside influences can appear the corrosion, the damage, to break off, to fall off, each connection spot to become less crowded, the cause earth body resistance increases, after or thunder and lightning, because the formidable electric current or some kind of reason influence, causes the arc-over electric discharge cause to meet the grounding damage, the short circuit and so on. These will make the protective earthing device resistance to increase, protect the overvoltage to elevate, will have the adverse effect to the equipment normal work. Do not say that some earth body steel products burying depth is insufficient. The earth resistance amounts to about generally 10 ohms, is smaller than with the standard request was equal to that 4 ohms are far from Measure to precautions.

Takes the measure to avoid the unnessential trip accident. In the work should complete following several points:

Do the defends and the completing test work before the arrester periodic inspection or the thunder and lightning season.

Do the completes grounding test, the service, and the inspection work regularly. Do the distribution transformer facility regular test, Keep the guarantee investment quality and the maintenance quality.

To control the quality of distribution transformer facility,do before completing strictly regular, throws transports, and the service preventive test, and enlarges to the distribution transformer facility patrols dynamics, to some hidden danger accident prompt discovery and prompt replacement and service, then the loss of the thunder and lightning certainly can fall to the lowest.

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